To make this sweet potato cornbread gluten-free, substitute the all-purpose flour with a 1:1 gluten-free flour blend suitable for baking. Additionally, ensure your cornmeal is certified gluten-free, as cross-contamination can occur during processing. All other ingredients are naturally gluten-free, but it is advisable to check labels—particularly for baking powder and sour cream—to confirm no hidden gluten-containing additives.